Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw

Jun Zhang; Yanmin Li; Lin Mei; Xiaoliang Yu; Xun Lv; Jinping Wang; Jin Yan; Rongyue Sun

LAPSE

Living Archive for Process Systems Engineering

LAPSE:2023.34754

Published Article

LAPSE:2023.34754

Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw

Jun Zhang, Yanmin Li, Lin Mei, Xiaoliang Yu, Xun Lv, Jinping Wang, Jin Yan, Rongyue Sun

April 28, 2023

Biomass fuels play an important role in the field of fluidized bed combustion, but due to the diversity and uncertainty of fuels, there are usually some problems of high CO emission that cannot be directly solved by combustion adjustment. In this paper, a 75 t/h biomass fluidized bed was taken as the research object. It was observed from the field test that the gas incomplete combustion loss reached 12.13% when mono-combustion of wheat straw was conducted, and the CO concentration in the exhaust gas exceeded 30k ppm. Combined with the CPFD numerical simulation, the combustion characteristics and influence of secondary air layout on CO reduction performance were discussed in detail. The results revealed that the gas temperature gradually increased along furnace height under the initial condition, and the maximum temperature was more than 1000 °C at furnace outlet. The air curtain of the secondary air jets was insufficient, and the wheat straw rose rapidly as it entered into the furnace. By arranging adjacent secondary air ports above each fuel-feeding inlet, the residence time of particles in the furnace could be significantly increased, thus, the furnace temperature distribution was more reasonable and the CO emission was reduced by 58.6%.

Record ID

LAPSE:2023.34754

Keywords

CO emission, fluidized bed, secondary air, wheat straw

Subject

Other

Suggested Citation

Zhang J, Li Y, Mei L, Yu X, Lv X, Wang J, Yan J, Sun R. Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw. (2023). LAPSE:2023.34754

Author Affiliations

Zhang J: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Li Y: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Mei L: Key Laboratory of Electromechanical Equipment Security in Western Complex Environment for State Market Regulation, Chongqing 401121, China; Chongqing Special Equipment Inspection and Research Institute, Chongqing 401121, China
Yu X: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Lv X: Xizi Clean Energy Equipment Manufacturing Co., Ltd., Hangzhou 310021, China
Wang J: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
Yan J: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China; Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China [ORCID]
Sun R: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China

Journal Name

Energies

Volume

16

Issue

8

First Page

3312

Year

2023

Publication Date

2023-04-07